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习题练习：Physics Unit12: Sound
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 作者: admin  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月07日 09:59  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following 7iv 88 oc:0 3yjlyvdsais a false statement?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound is conducted fuvf8 da9o /.ntastest through

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of sound i*)zl-,gdus ,c7 c atgzn a steel rod?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the temperature of kt y c*jtj8o -v0 pz.1mta(w1xthe air increases, what happens to the velocity of sound? (Assume that all other o8vt(t w*kxj0zm ta 1yc.j1-pfactors remain constant.)

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a 404-umlz u31uqf h( +fu ,on2sip0 Hz sound, the velocity of a 200 Hz sound throughm2 o-+zs1fuil u(h uu, 3qf4pn air is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelength of a 400 Hz sound, the wavv+z:dc zd(qf2elength of a 200 Hz sound in air:c d2zqdv+(zf is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencies greai 5 (7yneurdx+ej4* qm q,txr0ter than 20,000 Hz are called

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequenc nufs wqct.)do5/3h2 uy less than 20 Hz are called

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a sound source is emitting waves u- v6d jh6.yumyk2l2uihim1m. niformly in all directions. If you moveuh2mlmi uv6d-2. ymhjy ik.1 6 to a point twice as far away from the source, the frequency of the sound will be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, intensity i+ qly v4i8ieetfe )k ;ch-i(b;s proportional to

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity of a point source at a distance d from the source is I. Wha0f9m wkog cz.,t is the intensity c9 wgz,om.k f0at a distance 2d from the source?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source that is radiatzfbjo aw ; rj8 z2gba9ei,hg7o*8fepi/. dg5 +ing equally in all directions. What happens to 5zbdb 8w 7/feajz.i 8f +;9horg*g oap,eg 2jithe intensity of the sound? It reduces to

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source that is radiating equally ipsbc7qw, cipum e2(.9 n all directions. What happens to the intensity level of the sound? i bq,wc9eu. m pcp72(sIt drops by

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following increases as a sound becomes loude h/qwu9 y6+hybr?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly toward a speaker emitting a pure tone zx(/ b;)q w rgi4(4ztq 3ca:frwyup2w. What characteristic of the sg(cur )p4 z4zxqf ;bwaw:2w qi( r3/tyound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" of a musi6pvfj2 benemj ni l:i120.8dbcal note?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pitch" of a musical notedidmrpo8i4 21 kw:p-p?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from z ( vj06auai8yair into water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displace .- g9+6)odstvtrsv)o p4 zrgfment waves are

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wave on a guitar strin* gt)ssfihmh-k0 b,a8 fg2k( ig and the sound wave generated by the guitar as a result of this vibration. i sg-2fktm *bahhf,s)( i8g0kWhat do these two waves have in common?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is :31 igf*et p3h/m4xjzptus5e- 3bwyzz(ac 6hopen at both ends, there

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an open pipe of length L. What are the wavelengths ofng4yiyl-k 0 +r the three lowest tones produced by thisilyr 4k-0 gny+ pipe?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of length L is 200 Hz. Which on4b2cw *5mm9 e8tyi chre of the following frequenctc98eyhwrc m*5 i4mb 2ies will not resonate in the same pipe?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An open pipe of length L is res*0guazyw z- k1onating at its fundamental frequency. Which statz1*gyz 0 kuwa-ement is correct?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipelz+j bd9o. ;np which is open at one end and closed at the other, there

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a closed pipe of length L. Wh t*9ryaxvjlivcs gsxs 5v t + 57hanm+5;+2e2lat are the wavelengths of the three lowest tones psv; t592+hrtjlnx c*sase lx+ i5vgv27ma5+yroduced by this pipe?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in a closed hda fjx2k xw w/ha;(4;pipe of length L is 200 Hz. Which of the following freq4(h;h af2;/xwajxd wkuencies will not resonate in that pipe?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pipe of length L closed a ,+hrlka(5 *nktt uzp+t one end is resonating at its fundamental frequency. Which statement is cor+(r5 alh,ktzuk *n+ ptrect?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands between tqe/ :bq )ce-hum,p;sm)s6ma ywo speakers driven by the same source. Each speaker produces a toy s,h:sq/mamb))e;umecq-p6 ne with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beats, the two sound waves shp2targ5l . gb8kz+ qign)k pm4 vh08c-ould have

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sounded together and a particuls ;4kbnpjxxpb6 /v6 :lar beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones isp x/b j4plxk;snv6b:6 increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explaln g -b6s qw5jlg59 42*sgacvjins

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approaches a stationary observer. The frequency heard by t p 6nc,n+vxz yd49mro.he observxmvn 6.r9yzcd +,no4per is

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a stationary observer. The frequency heard yz2bn dox p ;,(;t2bvvby the obbo dz;pnv ;x y(bt2,2vserver is

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a jet plane were to double its MACH-speed, i z .0uen a/p+2c8oz4 fzrsygf1ts half-angle will decrease by a facgr/cfas p y+0z48foe z2zun1.tor of:

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The speed of an ultrasonic sound of frequency 45 kHdw+ot:k7i*d iz in air is 352 m/s. What is t + oidiwt7:d*khe air temperature?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the spuv kjp2g; tx ty9589qmeed of sound in air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a day when the speed 892ommzxjs9 j of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected b2 js899omjmxzack the sound?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You shout at a cliff, and hear the echo in 4.00 s. The temperature o1 u,uvtkg 4i-is $0 \; ^{\circ}C$. How far away is the cliff?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you hear thunder 5.0 s after seeing a flash of linf0o f sfumhc)+:ws( 7/bm5ktghtning, the distance to the li0 :( f 7mucs kfw)h/fn+mso5btghtning strike is about

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An echo is heard 2.0 *tqzk g*eu/. ps from a cliff on a day the temperature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a $30 \; ^{\circ}C$ day, there is an explosion. The sound is heard 3.4 s after seeing the flash. How far away was the explosion?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You drop a stone into05 0k my5twsom a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore airws0tyo5k50 m m resistance, and assume the velocity of sound is 340 m/s.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in air of a sound w7w6r- nx,vjce4 u niv6ave of frequency 500 Hz is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in air .(gc:cgj dn8qat $23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity level of a sound with intensity8u*/kob/gfm -l ;kjhx $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity of a 70o; c-fdf1u* zw-dB sound?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the intensi ooxu8 ,x- njlzcct.54ties of two sounds with intensity levels of 70 dB and 40 dBo-t ,jx8l5n4.cx ucoz?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines in a garage is 10-0q)wv k5ps6 pk3byr t0 dB. What is the intensity level generated by okq0rw6b3pytk)5 s -vpne engine?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source that is radi hyg7i f.n5)onating equally in alh. nofign5y 7)l directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source that is radiating equally i q1vi* 57z.j,x4/ gu t9jwje,ojxhkvbn all directiojxk,*vtg iujh 5w. j4/9vej 1xqzob7, ns is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A barking dog delivers about 1 mW of power, which is akg 4r9.2ezi7 my-rrtessumed to be uniformly dis2rk ie94m-g tyer 7.zrtributed in all directions. What is the intensity level at a distance 5.00 m from the dog?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level is 65 dB at a distance 5.00 m from a barking dog. What woua9shlc6- wq vkoz2,4o ld-kqh,lv 9 oocw24a zs6 be the intensity level if two identical dogs very close to each other are barking?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 15 m from a sound source the intensity leveynpwqdl8tz dweif 7r ,+zag 0i,+6zms1wf.+.l is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source.z a zr+,mww+,f gl.8+ dzis6dtpin7q 0ewfy1 radiates equally in all directions.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity level 5.0 m from a point source is 95 dB. At what distxnfkl,/a (6od-c5y r xance will ,r fa5ox/(ln6xd -kycit be 75 dB?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The third harmonic of a complex tone has a frequewnka5 nl9ud;pv s (kd:d2t95fncy of 1200 Hz. What is the frequency of the fourth harmonic:pna (99s5wfktk5 ;l dv2undd ?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harmonic of an open pipe is 900 Hz. Whajzkyhn0g/p) ;d.ca 9at is the length of)dp0 agzyn cajk.9/; h the pipe?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an opq)ng4p 1 j.-z pzpkbb2en pipe of length L is 400 Hz. What is the frequency of the lopgk qnb4zz-pp.b)2 1j west tone that will resonate in an open pipe of length 2L?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An organ pipe open at teb(w i/ r3 na.u93p(6 mg sh5zru-krfboth ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is thrbs6fiemzgpk n ( /3 (a. u-tr93rh5wue frequency of the second harmonic?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where the fu,j+: b h3zn/jt/byr temperature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The fundamental frequency in a pipe closed at one end is 33cddlz(qbz;8/f pq,s +w-ent8 0 Hz. What is the frequency of the third,lzc dsnb 8q;(tf/-8d+ wzepq harmonic?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the length of the shortest pipe closed on2j g:4f+y5;xredvpmc one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m c y4dv2rpf+;gj:x5m e/s?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is+2ccj j08gz zprbep 09mcm8)m in a room where the temperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where the temmta1 q16jq8mkgxf3 y 2perature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A closed organ pipe of length 0.75 m is playefgvdm j +m19; )1 l,bviw.9xpe2cywxbd when the speed of sound in air is 340 m/s. What is the fundamental frequ1v+1yjx pil.mmf2w9g,;) v eb c9bxdwency?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes of the same length:p kuxj2 ar)2 1geuc:c8eou(:d one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequencr:1g2c 8ex)ka ue 2c joupd:u(y of the closed pipe?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources each emit a fre sd3q5kuyu35m quency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sources would hear5dk3u s 5muqy3 no sound?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two speakers are placedgb 2,kw0*l(w ft v x1dy-ic+od side by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound,fy 0bcd wg*,ow- 2ktd+l(x1vi which of the following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two tunes have frequencies of 440 Hz and 444 Hz. What is the beat gp 4zcpie 9il8 g.v*j)frequency?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A music tuner uses a 550-Hz tuning fork to tune the f7 / 3ttkja7jddrequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the ind7t akdjt/j 73strument?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the sounds produced by two horns are b/tyy)2nak3wm yh*p4vt aqx 3lc5,odb x 7(c) 6 m and 7 m respectively. What beat frequency is heard when the horns are sa3c/t32 7b wvyq,a5ymhb* o)xdy4()ptn lckx ounded on a day when the velocity of sound is 340 m/s?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin strings on two violins indfpcu6 :7 hxf1jjq ,.x an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the st cj hf:. 71p,ufxdxj6qrings would bring them to the same frequency?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a stationary 1000-Hz sound soura3:e (viuf 18u ei;dlsce at twice the speed of sound. The observe( vi;18:sdle 3ei auufr hears a frequency of

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frev olx pi26k0a2quency of 1000 Hz) approaches a stationary observer ata0 o6kxpv2 il2 one-half the speed of sound. The observer hears a frequency of

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound has a frequency of 1000 Hz. If a listener moves with a speed of 30* .1jjl4gi2dood o6pq m/s away from the source, what is the frequency heard by the observer? (The soundioo2 d1dq l 6jp.g4jo* speed is 340 m/s.)

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A police car has an 800-Hz siren. It is traveling at 35 xu( bu(+qjv7ts i; be3m/s on a day when the speed of sound through airje;(7 bu+iv ( tux3bqs is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the frequency heard by a s/:/jw/yr d zi:x, fxvztationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the spe /zy /fdr: /xwx:,vizjed of sound is 340 m/s.

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling toward you at jd(hj r9341iu9 htngp6e3xkr 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What f9 9hk63djerxg143 (tpir hnu jrequency do you hear?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are moving at 120 km/h toward a statio-o0fspt -h: honj+n9c nary train. The train blows its 400-Hz whist t-0 nh9 np+:ofjchs-ole. Take the speed of sound to be 340 m/s. What frequency do you hear?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you at 1 q4d v+b+96jlscj mhr:w2 nqad/l9jq720 km/h. The train blows its 400-Hz whistle. Take the sq7 4sjjjq:2dnwrahm 9+/9 q6lc +bl vdpeed of sound to be 340 m/s. What frequency do you hear?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you at 120 km/h. It blows its whistle, and yoke4 /g)xphgz k2aq q-;u hear a tone of 400 H a);k-4 qxkpge/qzh2gz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistle?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. 7;wral5 i)yjqmvarhxlt1cz, ft /6 :/Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed of 30jrf y tl/ 1;z/vi:5wcmht7 lra6) xa,q.0 m/s?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. Assume the speed of sound qv o 8:.ya;gqein air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train wi8qgvq .yo:ae;th a speed of 30.0 m/s?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sonar is used to dete a kz*uqp 5htc,pra +6 y.9.f2pwedlz6rmine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is thc*d6 k9ahp 2 yzlw fp,pe+56 .aurtz.qe object moving?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the conical shock wave produced by a supersonic aircraft is(2u eb ao04joq $60^{\circ}$. What is the Mach number of the aircraft?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet flies at a speed of Mach 1.4. What is the0dgn1.c-ez( c q e(zyf half-angle of the conical shock wavn(zg 0y z1fe. (dc-ceqe formed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies from the Unitedvux6u-bg7ts 1 ijm*b -iki v63 States to Europe with a Mach number of 1.05 where the air b j7vv6-s3ugu6i*ti1mk- i xbtemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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